Perfect codes supply a tiling-based construction for symmetric Sudoku variants on Z_n^2, with complete enumeration of inequivalent grids for n=5 and n=8 plus a solver-based difficulty assessment.
Etzion.Perfect Codes and Related Structures
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Symmetric Sudoku-Type Games from Perfect Codes
Perfect codes supply a tiling-based construction for symmetric Sudoku variants on Z_n^2, with complete enumeration of inequivalent grids for n=5 and n=8 plus a solver-based difficulty assessment.